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Blue Pigments
Blue pigments are natural or synthetic materials, usually made from minerals and insoluble with water, used to make the blue colors in painting and other arts. The raw material of the earliest blue pigment, lapis lazuli, came from mines in Afghanistan, was refined into the pigment ultramarine. It was widely used for painting in the Middle Ages and Renaissance. Since the late 18th and 19th century, blue pigments are largely synthetic, manufactured in laboratories and factories. Ultramarine Ultramarine was the most prestigious and expensive of blue pigments. It was produced from Lapis Lazuli, a mineral whose major source was the mines of Sar-e-Sang in what is now northeastern Afghanistan. It was transformed into a pigment by the Afghans beginning in about the 5th century, and exported by caravans to India. It was the most expensive blue used by Renaissance artists. It was often reserved for special purposes, such as painting the robes of the Virgin Mary. Johannes Vermeer use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cobalt Blue
Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with aluminum(III) oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and historically has been used as a coloring agent in ceramics (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt. Historical uses and production Cobalt blue in impure forms had long been used in Chinese porcelain. The first recorded use of ''cobalt blue'' as a color name in English was in 1777. It was independently discovered as a pure alumina-based pigment by Louis Jacques Thénard in 1802. Commercial production began in France in 1807. The leading world manufacturer of cobalt blue in the nineteenth century was Benjamin Wegner's Norwegian company Blaafarveværket ("blue c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Egyptian Blue
Egyptian blue, also known as calcium copper silicate (CaCuSi4O10 or CaOCuO(SiO2)4 (calcium copper tetrasilicate)) or cuprorivaite, is a pigment that was used in ancient Egypt for thousands of years. It is considered to be the first synthetic pigment. It was known to the Romans by the name '' caeruleum''. After the Roman era, Egyptian blue fell from use and, thereafter, the manner of its creation was forgotten. In modern times, scientists have been able to analyze its chemistry and reconstruct how to make it. The ancient Egyptian word wꜣḏ signifies blue, blue-green, and green. The first recorded use of "Egyptian blue" as a color name in English was in 1809. Definition Egyptian blue is a synthetic blue pigment produced from a mixture of silica, lime, copper, and an alkali. Its color is due to a calcium-copper tetrasilicate CaCuSi4O10 of the same composition as the naturally occurring mineral cuprorivaite. It was first synthesized in Egypt during the Fourth Dynasty and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Han Blue
Han purple and Han blue (also called Chinese purple and Chinese blue) are synthetic barium copper silicate pigments developed in China and used in ancient and imperial China from the Western Zhou period (1045–771 BC) until the end of the Han dynasty (''circa'' 220 AD). Color Azurite was the only natural blue pigment used in early China. Early China seems not to have used a natural purple pigment and was the first to develop a synthetic one.Thieme, C. 2001. (translated by M. Will) Paint Layers and Pigments on the Terracotta Army: A Comparison with Other Cultures of Antiquity. In: W. Yongqi, Z. Tinghao, M. Petzet, E. Emmerling and C. Blänsdorf (eds.) ''The Polychromy of Antique Sculptures and the Terracotta Army of the First Chinese Emperor: Studies on Materials, Painting Techniques and Conservation.'' Monuments and Sites III. Paris: ICOMOS, 52–57. Han blue in its pure form is, as the name suggests, blue. Han purple in its pure form is actually a dark blue, that is close ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Han Dynasty
The Han dynasty (, ; ) was an imperial dynasty of China (202 BC – 9 AD, 25–220 AD), established by Liu Bang (Emperor Gao) and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–207 BC) and a warring interregnum known as the ChuHan contention (206–202 BC), and it was succeeded by the Three Kingdoms period (220–280 AD). The dynasty was briefly interrupted by the Xin dynasty (9–23 AD) established by usurping regent Wang Mang, and is thus separated into two periods—the Western Han (202 BC – 9 AD) and the Eastern Han (25–220 AD). Spanning over four centuries, the Han dynasty is considered a golden age in Chinese history, and it has influenced the identity of the Chinese civilization ever since. Modern China's majority ethnic group refers to themselves as the "Han people", the Sinitic language is known as "Han language", and the written Chinese is referred to as "Han characters". The emperor was at the pinnacle of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liubo
''Liubo'' () was an ancient Chinese board game played by two players. The rules have largely been lost, but it is believed that each player had six game pieces that were moved around the points of a square game board that had a distinctive, symmetrical pattern. Moves were determined by the throw of six sticks, which performed the same function as dice in other race games. The game was invented no later than the middle of the 1st millennium BCE, and was popular during the Han dynasty (202 BCE – 220 CE). However, after the Han Dynasty it rapidly declined in popularity, possibly due to the rise in popularity of the game of Go, and it became totally forgotten. Knowledge of the game has increased in recent years with archeological discoveries of Liubo game boards and game equipment in ancient tombs, as well as discoveries of Han dynasty picture stones and picture bricks depicting Liubo players. History It is not known when the game of ''liubo'' originated, although according to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hu (vessel)
A ''hu'' is a type of wine vessel that has a pear-shaped cross-section. Its body swells and flares into a narrow neck, creating S-shaped profile. While it is similar to ''you'' vessel, ''hu'' usually has a longer body and neck. The shape of ''hu'' probably derives from its ceramic prototype prior to the Shang dynasty (1600-1045 BC). They usually have handles on the top or rings attached to each side of neck. Many extant hu lack lids while those excavated in such tombs as Fu Hao's indicate that this type of vessel might be originally made with lids. Although it is more often to see ''hu'' having a circular body, there also appears ''hu'' in square and flat rectangular forms, called ''fang hu'' and ''bian hu'in Chinese. In addition, ''hu'' often came to be found in a pair or in a set together with other types of vessels. As wine had played an important part in the Shang ritual, the hu vessel might be placed in the grave of an ancestor as part of ritual in order to ensure a goo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Han Purple
Han purple and Han blue (also called Chinese purple and Chinese blue) are synthetic barium copper silicate pigments developed in China and used in ancient and imperial China from the Western Zhou period (1045–771 BC) until the end of the Han dynasty (''circa'' 220 AD). Color Azurite was the only natural blue pigment used in early China. Early China seems not to have used a natural purple pigment and was the first to develop a synthetic one.Thieme, C. 2001. (translated by M. Will) Paint Layers and Pigments on the Terracotta Army: A Comparison with Other Cultures of Antiquity. In: W. Yongqi, Z. Tinghao, M. Petzet, E. Emmerling and C. Blänsdorf (eds.) ''The Polychromy of Antique Sculptures and the Terracotta Army of the First Chinese Emperor: Studies on Materials, Painting Techniques and Conservation.'' Monuments and Sites III. Paris: ICOMOS, 52–57. Han blue in its pure form is, as the name suggests, blue. Han purple in its pure form is actually a dark blue, that is close to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Han Blue
Han purple and Han blue (also called Chinese purple and Chinese blue) are synthetic barium copper silicate pigments developed in China and used in ancient and imperial China from the Western Zhou period (1045–771 BC) until the end of the Han dynasty (''circa'' 220 AD). Color Azurite was the only natural blue pigment used in early China. Early China seems not to have used a natural purple pigment and was the first to develop a synthetic one.Thieme, C. 2001. (translated by M. Will) Paint Layers and Pigments on the Terracotta Army: A Comparison with Other Cultures of Antiquity. In: W. Yongqi, Z. Tinghao, M. Petzet, E. Emmerling and C. Blänsdorf (eds.) ''The Polychromy of Antique Sculptures and the Terracotta Army of the First Chinese Emperor: Studies on Materials, Painting Techniques and Conservation.'' Monuments and Sites III. Paris: ICOMOS, 52–57. Han blue in its pure form is, as the name suggests, blue. Han purple in its pure form is actually a dark blue, that is close ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berthe Morisot
Berthe Marie Pauline Morisot (; January 14, 1841 – March 2, 1895) was a French painter and a member of the circle of painters in Paris who became known as the Impressionists. In 1864, Morisot exhibited for the first time in the highly esteemed Salon de Paris. Sponsored by the government and judged by Academicians, the Salon was the official, annual exhibition of the Académie des beaux-arts in Paris. Her work was selected for exhibition in six subsequent Salons until, in 1874, she joined the ''"rejected"'' Impressionists in the first of their own exhibitions, which included Paul Cézanne, Edgar Degas, Claude Monet, Camille Pissarro, Pierre-Auguste Renoir and Alfred Sisley. It was held at the studio of the photographer Nadar. Morisot went on to participate in all but one of the following eight impressionist exhibitions, between 1874 and 1886. Morisot was married to Eugène Manet, the brother of her friend and colleague Édouard Manet. She was described by art critic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stannate
In chemistry the term stannate refers to compounds of tin (Sn). Stannic acid (Sn(OH)4), the formal precursor to stannates, does not exist and is actually a hydrate of SnO2. The term is also used in naming conventions as a suffix; for example the hexachlorostannate ion is . In materials science, two kinds of tin oxyanions are distinguished: *''orthostannates'' contain discrete units (e.g. K4SnO4) or have a spinel structure (e.g. Mg2SnO4) *''metastannates'' with a stoichiometry MIISnO3, MSnO3 which may contain polymeric anions or may be sometimes better described as mixed oxides These materials are semiconductors."Preparation, characterization and structure of metal stannates: a new family of photocatalysts for organic pollutants degradation." ''Handbook of Photocatalysts'' (2010), pp. 493–510. Nova Science Publishers, Inc. Nova Science Publishers is an academic publisher of books, encyclopedias, handbooks, e-books and journals, based in Hauppauge, New York. It was founded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cobalt
Cobalt is a chemical element with the symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Cobalt-based blue pigments ( cobalt blue) have been used since ancient times for jewelry and paints, and to impart a distinctive blue tint to glass, but the color was for a long time thought to be due to the known metal bismuth. Miners had long used the name ''kobold ore'' (German for ''goblin ore'') for some of the blue-pigment-producing minerals; they were so named because they were poor in known metals, and gave poisonous arsenic-containing fumes when smelted. In 1735, such ores were found to be reducible to a new metal (the first discovered since ancient times), and this was ultimately named for the ''kobold''. Today, some cobalt is produced specifically from one of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cerulean Blue
Cerulean (), also spelled caerulean, is a shade of blue ranging between azure and a darker sky blue. The first recorded use of ''cerulean'' as a colour name in English was in 1590. The word is derived from the Latin word '' caeruleus'', "dark blue, blue, or blue-green", which in turn probably derives from ''caerulum'', diminutive of ''caelum'', "heaven, sky". "Cerulean blue" is the name of a pigment. The pigment was discovered in the late eighteenth century and designated as cerulean blue in the nineteenth century. Cerulean blue pigment The primary chemical constituent of the pigment is cobalt(II) stannate (). The precise hue of the pigment is dependent on a variable silicate component. The pigment Cerulean blue was discovered in 1789 by the Swiss chemist Albrecht Höpfner. Subsequently, there was a limited German production under the name of ''Cölinblau''. It was in 1860 first marketed in the United Kingdom by colourman George Rowney, as "coeruleum". Other nineteenth c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
